C # - Create class and instantiate object

// A very simple class

namespace C3

    // Give this namespace so that when referenced in other projects, developers needn’t fully qualify

{

    public class Chapter_3

        // The name of the class so when users might like to instatiate

    {

        private string psName;

        // dimentioned space for a string to be stored privatly

        static void main()

        {         

            // this is the entry point for this class

        }

        public string gsName

            // This is a public property inside this class

            // the get and set simply use the private string to store data

        {

            get

            {

                return psName;

            }

            set

            {

                psName = value;

            }

        }

    }

}

 

Once I had this is wasn’t much use and so I used the old trick from VB where you have a master project that never gets released but serves as the driving GUI in all testing.  So I set up a new project, a Windows Form and referenced the above project in this.  I can now test this class works and even run it in the debug mode.  Very nice

 

// This is form class set up in VB Express 2008

// I have set this as the sole class in the project

// VERY IMPORTANT in this project I have added a refernece to my own class; Chapter3

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

// All of the above are the CLI or .NET in this instance

// All are class’s provided and by addin the using command we can use these class’s without fully qualifying the statment

using C3;

// I have a class that I have built with the namespace C3.  This using command will mean I dont need to fully qualify

// This will only work becuse I have referenced this project in the references of thsi project

namespace Executable_Project

    // This is the name of the project and by having this namespace it can be used in other class’s by making the link

    // when the other class has the using command

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            // This is the entry point for this class

            // The only instruction is to initialise the form

            InitializeComponent(); 

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            // This is a private routine inside this class, the void means that nothing is returned

            Chapter_3 oChapter_3 = new Chapter_3();

            // The says.  dimention me space for a new instance of the Chapter_3 class (fully qualified is c3.chapter3)

            //            make me a new chapter_3 and give is the object name of oChanpter3

            oChapter_3.gsName = “alex crossley”;

            // The oChapter_3 has a property called gsName that we will set to alex crossley

            MessageBox.Show(oChapter_3.gsName);

            // we will now get the property from the object and show it in a form

        }

    }

}